摘要
基于滑模观测器的永磁同步电机无传感器控制系统中由于滑模自身机制带来的高频抖动,会使电机转子位置以及速度估计时存在很大的误差。为了解决这一问题,将滑模观测器与锁相环技术结合起来,先通过滑模观测器估计电机反电动势,然后再构造基于锁相环结构的转子位置检测单元,从估计的反电动势中提取电机转子位置和速度信号。这种方法能够避免滑模观测器直接通过数值关系运算得到转子位置和速度存在的抖动现象,从而一定程度上削弱估计反电动势中的高频抖动分量对系统被估量的影响,提高了估计精度,仿真分析和实验结果均表明该方法的正确性和可行性。
Sliding mode observer has been successfully applied to sensorless control of permanent magnet synchronous motor,however,the side effect of the sliding mode method caused chattering due to its mechanism,so the estimation errors of rotor position and velocity would be increased.To solve the chattering problem,a new approach was presented by combining sliding mode observer with phase-locked loop.Firstly,back electromotive force was estimated by means of sliding mode observer,then rotor position detected system based on phase-locked loop was designed,furthermore,the rotor position and velocity signal could be extracted from estimated back electromotive force.The proposed approach could instead of the traditional sliding mode observer,which obtained the rotor position and velocity signal directly by means of numerical operation.So it could effectively reduce the affect of the sliding mode chattering and improve the estimation precision of rotor position and velocity.The results of experimental and simulation show the proposed approach is correct and feasible.
出处
《电气传动》
北大核心
2013年第8期8-12,共5页
Electric Drive
基金
浙江省自然科学基金资助项目(Y108766)
关键词
永磁同步电机
无传感器控制
反电动势
滑模观测器
锁相环
permanent magnet synchronous motor（PMSM）
sensorless control
back electromotive force
sliding mode observer
phase-locked loop（PLL）
作者简介
李冉（1980-），男，博士，工程师，Email：lrhappy2006@sohu．com
